#include <stdio.h>

float mult(float);

int main()
{
	float a,z;
	a = 1.34;
	printf("调用前,a = %f\n",a);
	z = mult(a);
	printf("调用后;a = %f\n",a);
	printf("z = %f\n",z);
	return 0 ;
}

float mult(float a)
{
	a = a*a;
	printf("调用中,a = %f\n",a);
	return (a) ;
}

